Direct-service one-point-control dume-waiter.



- H. 61 B. RUWNTRYEE. DIRECT SERVICE ONE POINT CONTROL DUMB WAITER.

APPLICATION FILED APR.8,1914- 1, 178,753. Patented Apr. 11, 1916.

2 SHEETSSHEET l- QwwwmM/a: I Q

'IXll'. COLUMBIA PLANOGRAPH 20., WASHINGTON, n.

H. & B. ROWNTREE.

DIRECT SERVICE ONE PO INT CONTROL DUMB WAITER.

APPLICATION FILED APR. 8, I914- Patented Apr 2 SHEETS- SHEET 2.

UNITED STATES PATENT curios,

HAROLD ROWNTREE, OF KENILWORTH, ILLINOIS, AND BERNARD ROWNTREE, OFORADEL, NEW JERSEY, ASSIGNORS TO BURDETTE-BOWNTREE MANUFACTURINGCOMPANY, A CORPORATION ILLINOIS.

DIRECT-SERVICE ONE-POINT-GONTROL DUMB-WAITER.

Application filed. April 8, 191

To all whom it may concern:

Be it known that we, HAROLD RowNTRnE and En mane ROWNTREE, both citizensof the United States, and residing, respectively, at Kenilworth, countyof Cook, State of Illinois, and Oradel, county of Bergen, State of NewJersey, have made a certain new and useful Invention in Direct-ServiceOne- Point-Control Dumb-WVaiters, of which the following is aspecification.

This invention relates to dumbwaiters, and particularly to dumbwaitersof the one point control type.

The object of the invention is to provide a direct service control fordumbwaiters vof the one point control type.

A further object of the invention is to provide means whereby the dumbwaiter, when started on its travel to any predetermined floor or landingmust return to the starting point or control floor before it can be sentto any other floor or landing.

A further object of the invention is to provide a construction andarrangement of control for dinnb-waiters whereby the operation thereofis controlled from one point or floor only, to cause the car to proceedto any desired floor or landing, and to one floor or landing only,'afterbeing started up, and to return to the starting floor or control pointbefore it can be sent to or arrested at any other floor or landing. I a

A further object of the invention is to provide a direct service onepoint control system of the nature referred to wherein signals may bemade from any floor or landing to the starting floor or control point,but without accomplishing any control of the car from the signalingpoints.

A further object is to provide means in a one point control system ofthe class referred to whereby a signal is made whenever the hatchwaydoor is open at any landing, but will not be made while the car is inmotion or is at the starting or control floor.

A further object is to provide means in a control system of the naturereferred to whereby the closing of the hatchway door at any landing towhich the car has been sent from the control floor, will cause the carto return to the control floor.

A further object is to provide means in a Specification of LettersPatent.

Serial No. 830,405.

control system of the nature referred to whereby the car cannot be movedwhile any one of the hatchway doors is open.

A further object is to provide means in a control system of the naturereferred to whereby a hatchway door can be opened only when the car isat rest opposite said door.

A further object is to provide means in a control system of the naturereferred to whereby the hatchway door is automatically opened only whenthe car is brought to rest opposite it.

A further object is to provide means in a control system of the naturereferred to whereby the car can be arrested and returned to the startingfloor at any time by the starter or attendant at the starting pointafter it has been started on its trip.

A further object is to provide a direct service one point control fordumbwaiters which is simple in construction and arrange ment andeflicient in operation.

Other objects of the invention will appear more fully hereinafter.

The invention consists substantially in the construction, combination,location and relative arrangement, all as will be more fully hereinafterset forth, as shown in the accompanying drawings, and finally pointedout in the appended claims.

Referring to the accompanying drawings: Figure l is a VlQW in diagramillustrating a direct service one point control dumbwaiter systemembodying the principles of our invention. Fig, 2 is a broken view inelevation showing a dumbwaiter hatchway and car, and control devicesassociated with the ear and employed in accomplishing the objects of ourinvention.

The same part is designated by the same reference sign wherever itoccurs throughout the several views.

In the operation of automatic dumbwaiters of the one point control type,the car is under the control and direction of an attendant or operatorstationed at the con trol point or floor or other despatching point, andthe car can be started or its operations controlled only from thissingle station or one point control. In many instances it is desirablethat while the car remains under the control and direction of theattendant at the despatching statlon or one point control, it can besent to any de-' sired floor at any time but it must return to thestarting point after serving a floor before it can be sent to any otherfloor. This is called the direct service control of one point controldumb waiters, and it is to the provision of means to secure directservice operation of one point control automatic dumb waiters that ourpresent invention more particularly relates.

In Fig. 2 we have indicated an automatic dumbwaiter construction andarrangement embodying our invention wherein 13 is the car, whichoperates in a hatchway A, having doors B, at the landing floors wherethe car is to stop. The car hoisting motor is indicated at C, and may beof the usual or any desired or preferred type or construc tion. \Veprefer to employ counter-weighted hatch doors which are normally lockedin closed position and against the action of the counterweight so thatwhen the lock of a door is released, the door will automatically open.We have indicated at D, a shoe which is carried by the car and which isprojected outwardly by a solenoid 15, when the latter is energized,thereby releasing the lock of the door opposite which the car may bestanding at the time said shoe is projected. The car is provided with asignal device 14:, shown, for illustration, as a bell. The door, whenclosed, maintains a switch 23, 22, 21, closed, but when any door is openits associated switch is open. The hatchway is provided with limitstops, 16, 17, 18. The car controller is indicated at 19, and associatedtherewith or in convenient relation thereto is an annunciator 27, whilea push button 24, 25, 26 is located at each floor or landing at whichthe car is to stop. A control push button 28 is also located, togetherwith the control box 19, and annunciator 27, at the control point fromwhich the car operations are controlled.

In Fig. 1 we have shown in diagrammatic form the wiring connections forthe direct service one point control automatic dumbwaiter system of ourinvention and wherein 1, designates the wall switch, and 2, 3 and smallauxiliary switches, of which 2 and 3, have each a single magnet foroperating them while switch -l employs two magnets. Numerals 5 and 6,respectively designate the magnets or solenoids which operate the mainswitches for controlling the up and down travel of the car hoistingmotor. A series of magnets, indicated at 7, 8, 9, 10, corresponding innumber to the different iioors at which the car is to stop are employed.In this instance we have shown four of such magnets, and their functionis to cooperate with the automatic motor operated control mechanism inarresting the car when it reaches a predetermined landing at which thecar is to stop. Selector switches for controlling the intermediate stopsare indicated at 11 and 12. It will be understood that the limit switch16 is located at the upper end of the hatchway and is autoinaticallyopened when the car 13 reaches the upper limit of its travel, andsimilarly, the limit switches 17, 18 are located at the lower end of thehatchway and are also designed to be'opened automatically by the carwhen it reaches the lower limit of its travel. The push buttons 21, 25,26, which, as above explained, are respectively arranged at the floorsabove the first, starting or despatching floor, are respectivelyarranged to operate the pointers of the annunciator 27, which pointersare suitably designated to correspond respectively with the differentfloors. The annunciator is preferably placed adjacent the controllingbox 19. Of course it is to be understood that there will be as many pushbuttons, 2 1, 25, 26 as there are floors to be served by the car, and acorresponding number of pointers in the annunciator box. In accordancewith our invention we provide an auxiliary switch, which may be of anydesired character, indicated at 28, and so arranged and connected thatwhenever said switch 28 is open, the car will be arrested, as will beexplained later and will also be caused to immediately and automaticallyreturn to the control station or from the starting or despatching point.A battery 29 or other suitable source of current may be provided for thecircuit of the signal device let on the car and for the circuits of theannunciator 27.

We will now describe the operation and electrical connection concernedtherewith.

Let it supposed that the car is at the first or main floor and that itis desired to despatch it from that floor, which may be regarded as thecontrolling point or despatching floor, to the third floor. It will besupposed also that all the hatchway doors B, have been closed and thatthe car is ready to start on its travel. The controlling operator willmove the handle 80 on the control base 19 until it points to the figure3 on the dial-plate of said base which corresponds with the third floor,it being understood that said dial carries as many floor designations asthere are floors at which the car is to stop. The operator thendepresses push button 37 at the pivotal axes of the handle 80. This willcomplete circuit connection between the strip 36 and the contact piece39 under the floor designation 3. This will complete a circuit asfollows: From switch 1 to binding post 30, to the armature 31 of switch1, to contact 33, to contact at, to armature of switch 3,

to contact strip 36 of the control base, to contact 39, to the floormagnet 9. It is noted here, that the floor magnets 7, 8, 9, 10 have oneend of the winding of each magnet attached to the core of said magnetwhile the other end of the magnet windings are all connected to acommonreturn conductor. Upon reaching the floor, magnet 9, the circuit abovedescribed continues through the coil of said magnet to the common returnconductor 51, then to the binding post 52, through auxiliary switch 28,thence successively through all of the door switches 20, 21, 22, 23 inseries and then to the return binding post 53 of switch 1. This circuitbeing completed causes magnet 9 to become energized thereby drawing upthe armature 50 of said magnet against the core of said magnet and thisaction then completes the following branch circuit: from switch 1 andbinding post 30 to armature 31 of switch 4, magnet 32, then to andthrough the coils of the large solenoid 5, which controls the upswitches of the motor, thence to the upper limit stop 16, to the bindingpost 43 of magnet 10, thence to the points 44, 45 of the selectors 12,11. Under the conditions as sumed, the car is at the bottom floor andconsequently, the selectors 11, 12 will be in contact respectively withcontact points 45, 44 and therefore the circuit from 44 will continuethrough the selector switch 12 to the armature 50 of magnet 9 throughthe core of said magnet, then through the windings of said magnet to thecommon return 51 and on through the switch 28 and the door switches 20,21, 22, 23 to the return binding post 53 of switch 1. The closing ofthis circuit will energize magnet 32 of switch 4 and also the largesolenoid 5 and will also continue to energize magnet 9 even when thefirst circuit above traced is opened. The energization of the largesolenoid 5 will cause the motor circuits to be closed and the switch 54to be opened. The closing of the motor circuit for the up movement ofthe car through the actuation of the switch controlled by solenoid 5starts the motor and hence also the upward travel of the car on itsjourney toward the predetermined floor, in this instance the thirdfloor, at which the car is to stop. The energization of small magnet 32causes armature 31 of switch 4 to be attracted, thereby moving saidarmature 31 out of connection with contact 33 and into connection withcontact 56, thereby breaking the circuit first above traced through thecontrol base 19 and floor mag net 9, but, as before explained, thesecond circuit which was completed through magnet 9 and the selectorswitch 12 remains completed and therefore magnet 9 continues to beenergized. When the armature 31 of switch 4 comes into connection withcontact 56, the following circuit is completed: From switch 1, bindingpost 30, to armature 31, contact 56, small magnet 57 which also actsupon armature 31 of switch 4, then to com mon return 51 and throughauxiliary switch 28 and the floor switches 20, 21, 22, 23 to return at53 of switch 1. The completion of this circuit causes magnet 57 tobecome energized so that during the time the car is in motion thearmature 31 of switch 4 is held against contact 56 by the action of bothmagnets 32, 57. Referring to switch 3, it is to be noted that the magnet58 has its wiring connections made to the opposite sides of the motorarmature and therefore whenever said armature is in motion this magnetwill be energized by the differences in electric pressure on oppositesides of the armature, and the magnet armature 35 will consequently bemoved from connection with contact 34, thereby breaking the circuit ofthe conductor strip 36 of the control base.

19. At this time the hoisting motor is in operation and the car istraveling from the first or controlling floor toward the third floorwith the main motor switch closed by solenoid 5, with the floor contactcontrolled by magnet 9 closed, with the circuit open between contacts 54of the main motor up switch, with the switch 4 armature 31 closed on tocontact 56 and open from contact 33, and with switch 3 open from contact34. This means that all connections of current to the control base 19are broken.

When the car reaches the third floor a moving part which is operatedcoincidently with the travel of the car engages selector 12 and moves itout of connection with contact 44, thereby breaking the circuit whichincludes the switch controlling solenoid 5, the small magnet 32 and themagnet 9. The switch controlled by solenoid 5 will there fore be open,thereby breaking the motor circuits and stopping the car and closingcontacts 54 upon each other. The floor magnet 9 becomes deenergized,thereby opening the connections which it controls.

The small magnet 32 becomes deenergized but this does not open switch 4for the reason that said switch or the armature 31 thereof continues tobe held in electrical connection with contact 56 through the action ofmagnet 57,the circuit of which re mains closed. Thereupon the followingcircuit is completed; from switch 1 and binding post 30, armature 31 ofswitch 4, contact 56, contacts 55 to contact 54 to solenoid 15 on thecar to binding post 52, auxiliary contact 28, door switches 20, 21, 22,23 to return binding post 53 of switch 1. The completion of this circuitenergizes solenoid 15, thereby causing a projection of the shoe 1) (Fig.2) which controls the lock of the door B at the landing at the thirdfloor, thereby releasing said lock and since the door is overcounter-weighted as above explained, the door immediately opens, therebyopening the door switch 22, for instance, at the third floor. Theopening of this switch also opens the circuit of small magnet 57 as thereturn of this magnet also passes through the door switches. The switch1 therefore becomes opened again and the armature 31 thereof broughtinto connection with contact 33. When armature 31 leaves contact 56, thecircuit of solenoid 15 on the car is thereby opened. Thus it will beseen that the solenoid 15 is only energized momentarilyfor the intervalbetween the time the car has stopped and the hatchway door B opposite ithas moved sufliciently to open its associated switch.

The moment the armature 31 of switch 1 again comes into connection wit-hcontact 33, the following circuit is completed: From switch 1 andbinding post 30 to armature 31, contact 33, contact 3-1 of switch 3,armature 35, contact strip 36 of the control box, wire 42, limit stopswitch 18, contact 11 on the control base which corresponds with thefirst floor stop, thence to magnet 59 of switch 2 and to return post 53of switch 1. This energizes magnet 59 of switch 2 and causes thearmature 81 thereof to move into connection with contact 60. Thiscompletes a. circuit from battery 29 to contact 60, to armature 81,through the signal device let on the car, back to the battery 29,thereby causing the signal to be operated the moment the door has openedsufiiciently to break the door switch circuit. The signal devicecontinues to operate, or if said signal device is in the form of a bell,the bell continues to ring until the associated hatch door is againclosed. Thus it will be seen that the car has traveled from thedespatching floor or control point to the third floor, has come to restopposite the third floor, the hatchway door opposite the car at thethird floor landing has automatically opened and the signal device hascommenced to operate, thereby attracting the attention of the attendanton the third floor. will then perform the duties required by thepresence of the car at the third floor landing, by unloading thecontents from the car or loading material on to the car, as the case maybe and then will close the door. lVhen the door closes completely thelatch will operate to lock it in its closed position, said latch notbeing held retracted as by the solenoid 15 as said solenoid is no longerenergized, the circuit thereof being broken by reason of the fact thatat this time the armature 31 of magnet 4: is no longer in connectionwith contact 56. The moment the door is completely closed its associatedswitch 22, for instance, again closes and thereupon the followingcircuit is completed; from switch 1 and binding post 30 The attendant toarmature 31 of switch 4, contact 33, contact 34, armature 35, contactstrip 36 of the control base 19, wire 41-2, limit switch 18, contacte11, floor magnet T to common return 51, auxiliary switch 28, doorswitches 20, 21, 22, 23 to return binder post 53 of switch 1. Thisenergizes magnet 7 and draws its armature 16 against the core of saidmagnet, thereby completing the following circuit: From switch 1 andbinding post 30 to armature 31 of switch 4:, magnet 32 the down motorswitch controls solenoid 6, the lower limit stop 17, the armature 16 ofmagnet T, the core of said magnet, through the coils of said magnet,common return 51, auxiliary switch 28, door switches 20. 21, 22, 23 toreturn binding post of switch 1. This closes the motor circuits tooperate the motor in a direction to cause the down travel of the car.The car thereupon starts upon its return travel. When it reaches thefirst floor it will be arrested by the opening of switch 17, which isopened by the car reaching its lower limit of travel, thereby breakingthe circuit passing through the floor magnet 7 and the solenoid 6, aswell as that of magnet 32 of switch 1. The succeeding action will be thesame as that above described when the car stopped at the third floorwith this differ ence: hen the attendant opens the hatchway door at thecontrolling station or first floor, the signal device 11 will notoperate because at this time the limit switch 18 will be opened therebyopening the circuit of magnet 59 and consequently the armature 81 ofsaid magnet is not in connection with contact 60 which is included inseries in the circuit of the signal device. Another difference is thatwhen the hatchway door at the controlling point or first floor has beenclosed again the small magnet 7 will not be energized since the limitstop 18 which is included in series with the windings of said magnetwill be open.

We will now explain the action and purpose of the auxiliary switch 28.

It sometimes happens after a car has been started on its journey fromthe first or despatchingfloor toward any other pre-determin'ed floorthat the operator finds he has mace a mis'alre and has started the cartoward the wrong floor, that is, he has erroneously set the controlhandle 80 of the control base to the wrong floor designation on the basedial. In such event the car may be arrested in its travel and caused toreturn to the despatching floor, simply by opening momentarily theauxiliary switch 28 and then closing the same, that is, in case theswitch 28 is in the form of a push button, by simply depressing thebutton for an instant and then releasing it. It will be seen that theauxiliary switch 28 is always included in the circuit of the floorcontrol magnets 7,8, 9, 10 and also of the switch controlling thesolenoids 5, (3, whenever any one of said floor magnets or either ofsaid solenoids is in operation. The moment the auxiliary switch 28 isclosed again, it operates exactly the same as when a door has beenopened and closed again as above ex- I plained. There is thisdiii'erence, however, between the car being automatically arrested atany floor or being arrested by means of the auxiliary switch 28. Whenthe car is arrested automatically, at a landing or floor, the solenoid15 which controls the hatohway door lock is energized, as aboveexplained, and is deenergized again as soon as the hatohway door startsto open. On the other hand, when the car is arrested by the operation ofthe auxiliary switch 28, being opened, the circuit of solenoid 15, whichalso includes said switch 28 is also opened and consequently thesolenoid 15 will not be energized even in case the arrest of the car byopening the switch 28 should happen at the instant when the car isopposite a hatohway door and there fore said hatohway door will not beopened and when the switch 28 is again closed, the car willautomatically return to the despatching floor.

From the foregoing description it will be seen that we provide anexceedingly simple and efficient automatic elevator system of the directservice one point control type wherein an attendant at the controlstation by simply moving the control base pointer into position topredetermine a floor or landing for the car and then close an electriccircuit, the car hoisting motor is put into operation to cause the carto proceed to the predetermined floor or landing. When the car arrivesat the predetermined floor or landing, it is automatically arrested andthe hatohway door at said landing or floor is automatically unlocked andautomatically opens, and a signal device is automatically put intooperation. After the completion of the purpose for which the car isdespatched to the predetermined landing, the mere act of closing thehatohway door at that landing automatically causes the hoistingmechanism to start up in a direction to return the car to thedespatching floor or control point, the car coming to rest at thedespatching floor but without causing the signal device to be operatedat the starting floor when the hatohway door at that floor is open norwill the mere closing of the hatohway door at the starting floor set thehoisting mechanism in operation. It will also be seen that the attendantat the control station may be notified through the push button signalsand annunciator from any floor that the car is desired at that floor butthe attendant at any other floor, except the starting floor, has noother control over the car movements except to notify the startingattendant that the car is desired, and the return of the car to thestarting floor by the floor attendant merely closing the door. It willalso be seen that at any time the starting attendant may arrest thetravel of the car after it has been despatched from the starting flooror station and cause it to return automatically to the starting station.

It should be explained that the switch 3 plays an important part in itscooperative relation with reference to the function and operation of theauxiliary switch 28. When the car is stopped by opening the switch 28and when the switch is closed again, it would immediately complete thereverse circuit of the motor. In order to prevent the reverse circuit ofthe motor being completed until the motor armature has stopped revolvingin the opposite direction, the switch 3, or its control magnet 58 isinterposed in the armature circuit and therefore even if the switch 28is instantly closed after having been opened, the reverse motion of thehoisting motor will not commence until the armature has ceased torevolve in the other direction.

While we have described a construction in which when the car reaches apredetermined landing the door opposite the car automatically opens uponrelease of the door lock. It is obvious that the automatic opening ofthe door is not an essential of our invention, since the door lock maybe released without the door automatically opening, in which case thedoor maybe opened by hand by an attendant, on the floor at which the carstops. In this case the opening of the door by hand will accomplish thesame purposes and result in the same operations as where the door opensautomatically.

Having now set forth the object and nature of our invention, and aconstruction and arrangement embodying the principles thereof, what weclaim as new and useful and of our own invention and desire to secure byLetters Patent is:

1. In an automatic elevator system, a hoisting mechanism, means locatedat a controlling station for controlling said hoisting mechanism, saidmeans operating to start the car and to arrest it automatically at anypredetermined landing and automatic means at the predetermined landingfor operating the hoisting mechanism controlling means to cause the carto return to the controlling station when the landing door is closed.

2. In an automatic elevator system, a hoisting mechanism, means locatedat a controlling station for controlling said hoisting mechanism, saidmeans operating to start the car and to arrest it automatically at anypredetermined landing, and a signal device on the car operable only whenthe car is at the predetermined landing.

3. In an automatic elevator system, a hoisting mechanism, means locatedat a controlling station for controlling said hoisting mechanism, saidmeans operating to start the car and to arrest it automatically at anypredetermined landing, a hatchway door, a Signal device on the car, andmeans controlled by said door for rendering the signal inoperative andthe hoisting mechanism control means operative when the door is closed.

I. In an automatic elevator system, a hoisting mechanism, means forcontrolling the same, said means operating to start the car and toarrest it automatically at a predetermined landing, a hat-chway door atthe landing at which the car is arrested, a lock therefor, meanscontrolled from the car when it reaches the predetermined landing forreleasing said lock, and means controlled by the closing of said doorfor caus ing the car to return to its starting point.

5. In an automatic elevator system, a hoisting mechanism, means forcontrolling the same, iid means operating to start the car and to arrestit automatically at any predetermined landing, a hatchway door at thelanding at whichthe car is arrested, means controlled by the opening ofsaid door for rendering the motor controlling means inoperative andmeans controlled by the closing of the door for causing the car toreturn to the starting point.

6. In an automatic elevator system, a hoisting motor, means located at acontrolling station for controlling the same, said means operating tostart the car and to arrest it automatically at any predeterminedlanding, a hatchway door at the landing at which the car is arrested,means controlled by the opening of said door for rendering the motorcontrolling means at the controlling station inoperative, and meanscontrolled by the closing of the door for causing the car to return tothe starting point.

7. In an automatic elevator system, a hoisting motor, means forcontrolling the same, said means operating to start the car and toarrest it automatically at anyipredetermined landing, a hatchway door, asignal device on the car, and means controlled by the door for renderingthe signal operative and the motor control inoperative when the door isopened.

8. In an automatic elevator system, a hoisting motor, a controlmechanism therefor, said mechanism operating to start the car and toarrest it automatically at any predetermined landing, a hatchway door, asignal device, and means controlled by the door for rendering the signaldevice operative, and the motor control mechanism inoperative when thedoor is opened.

9. In an automatic elevator system, a hoisting motor, a controlmechanism therefor, said mechanism operating to start the car and toarrest it automatically at any predetermined landing, a hatchway door, a

signal device, and means controlled by the door for rendering the signaldevice inoperative and the motor control mechanism operative when thedoor is closed.

10. In an automatic elevator system, a hoisting motor, a controlmechanism therefor located at a controlling station and operating tostart the car and to arrest it automatically at any predetermined fioor,a hatchway door, a. signal device on the car, and means controlled bysaid door for rendering the signal operative and the hoisting motorcontrol means inoperative when the door is open.

11. In an automatic elevator system, a hoisting motor, controlling meanstherefor located at a control station, said means op erating to startthe car and to arrest it antomatically at any predetermined landing, andmeans at the control station for causing the return of the car to thestarting floor after said motor control means have inaugurated adespatch of the car from said floor.

12. In an automatic elevator system, a hoisting motor, controlling,means therefor located at a control stat-ion, said means operating tostart the car and to arrest it antomatically at any predeterminedlanding, and auxiliary control means also located at the control stationfor arresting the car while in action as the result of being despatchedfrom the starting floor, and causing the cart to return to the startingfloor.

13. In an automatic elevator system, a hoisting mechanism, means forcontrolling the same, said means operating to start the car and toarrest it automatically at any predetermined landing, a hatchway door atthe landing at which the car is arrested, means controlled from the carwhen it reaches the predetermined landing for causing the door to openautomatically, and means controlled by the closing of the door forreturning the car to its starting point.

i i. In an automatic elevator system, a hoisting mechanism, means forcontrolling the same, said means operating to start the car and toarrest it automatically at any predetermined landing, a hatchway door atthe landing at which the car is arrested and operative when the carreaches the predetermined landing for opening said door, and means madeoperative by closing the door for returning the car to its startingpoint.

15. In an automatic elevator system, a

ll i

hoisting mechanism, means for controlling 13c the same, said meansoperating to start the car and to arrest it automatically at anypredetermined landing, and means controlled by the closing of the doorat the said landing for operating the hoisting mechanism to cause thecar to return to the starting floor.

16. In an automatic elevator system, a hoisting mechanism, means forcontrolling the same, said means operating to start the car and toarrest it automatically at any predetermined stopping point, a door ateach floor at which the car is to stop, a switch operated by each door,a signal. device arranged on the car, means for controlling the signaldevice and means controlled by the door switches for controlling thesignal controlling means.

17. in an automatic elevator system, a hoisting mechanism, means forcontrolling the ae, said means operating to start the car and to arrestit automatically at any predetermined stopping point, a door at eachfloor at which the car is to stop, a switch o erated by each door, asignal de vice arranged on the car, a circuit therefor, means forcontrolling said circuit, and means controlled by the door switch forcontrolling said circuit controlling means to close the signal circuitwhen a door is opened.

18. In an automatic elevator system, a hoisting motor, means forcontrolling the same, said means operating to start the car and toarrest it automatically at any predetermined landing or floor, ahatchway door at each landing or floor, a locking device for each door,a signal device on the car, means automatically operated when the cararrives at the predetermined landing or iioor for releasinggthe lock ofthe door at that landing or floor, and means controlled by the openingof said door for rendering operative said signal device.

19. In an automatic elevator system, a hoisting motor, means located ata control station for controlling said motor, said means operating tostart the car and to arrest it automatically at any predetermined floor,a. hatchway door at each floor, a lockiug device for each door, a signaldevice on the car, meansautomatically operated when the car arrives atthe predetermined floor for releasing the lock of the door at thatfloor, and means controlled by the opening of said door for renderingoperative said signal device.

20. In an automatic electric elevator, a hoisting mechanism, means forcontrolling the same, said means including an electric circuit operatingto start the car and to arrest it automatically at any predeterminedstopping point, a signal corresponding to each floor or landing at whichthe car is to stop associated with said circuit, and an circuitoperating to start the car and to arrest it automatically at anypredetermined stopping point, a signal corresponding to each floor orlanding at which the car is to stop, associated with said circuit, andarranged to indicate to the hoisting inechanism attendant in advance ofthe starting of the car the floor at which the car is to stop, means foroperating said signal device from the various floors or landings, and asignal device on the car, made operative while the car is at apredetermined stopping point to which it has been sent.

22. In an automatic electric elevator, a hoisting mechanism, means forcontrolling the same, said means including an electric circuit operatingto start the car and to arrest it automatically at any predeterminedstopping point, a signal corresponding to each floor or landing at whichthe car is to stop, associated with said circuit and arranged toindicate to the hoisting mechanism attendant in advance of the startingof the car the floor at which the car is to stop, means for operatingsaid signal device from the various floors or landings, a hatchway doorat each floor or landing, a. signal on the car, and means controlled bythe opening of the doors at the landing opposite which the car hasstopped, for male ing operative the car signal.

23. In an automatic electric elevator, a hoisting motor, means forcontrolling the same, said means operating to start the motor and toarrest the same when the car arrives at any predetermined landing, ahatchway door located at each landing, a loclr therefor, means forreleasing said loch, electric devices for operating said releasingmeans, a circuit for said electric devices, and a magnet connectedacross the terminals of the motor armature for controlling said circuit.

24. In an automatic electric elevator, a hoisting motor, a car, ahatchway door, a loclr for the latter, electric devices for releasingthe lock, means for controlling said motor including a main switch, saidswitch when opened operating to close the circuit of the lock releasingelectric devices.

25. In an automatic elevator, a car arranged to operate betweenlandings, a hoisting mechanism, control devices therefor,

means at one landing for operating said devices to cause the car tostart from said landing and to stop automatically at the other landing,a door at the last mentioned landing, and means controlled by theclosing of said door for causing the car to return to the startinglanding.

26. In an automatic elevator, a car arranged to operate from a startinglanding to any one of a plurality of other landings, means to start thecar from the starting landing and to arrest it at any predetermined oneof the other landings, a door at the predetermined landing, and meanscontrolled by the closing of said door for causing the car to return tothe starting landing.

27. In an automatic elevator, a car arranged to operate from a startinglanding to another landing, means to start the car from the startinglanding and to arrest it at said other landing, a signal device on thecar, a door at said other landing, means controlled by the opening ofsaid door for actuating said signal device, and means controlled by theclosing of said door for causing the car to return to the startinglanding.

28. In an automatic elevator, a car arranged to operate from a startinglanding to another landing, means to start the car from the startinglanding and to arrest it at said other landing, a signal device on thecar operable only when the car is arrested, a door at said other landingand means con trolled by the closing of said door for caus ing the carto return to the starting landing.

29. In an automatic elevator, a car arranged to operate from a startinglanding to another landing, means to start the car from the startinglanding and to arrest it at said other landing, a door at said otherlanding and a signal device on the car, said signal device beingoperable only When the car is arrested and said door is open.

30. In an automatic elevator, a car arranged to operate from a startinglanding to another landing, means to start the car from the startinglanding and to arrest it at said other landing, a door at said otherlanding, a signal device on the car, said signal device being operatedonly When the car is arrested and said door is open, and meanscontrolledby the closing of the door to render the signal inoperative and toreturn the car to the starting landing.

31. In an automatic elevator, a car arranged to operate from a startinglanding to another landing, means to start the car from the startinglanding and arrest it at said other landing, a door at said otherlanding, and means to automatically return the car to the startinglanding, said means being inoperative when said door is open.

32. In an automatic elevator, a car arranged to operate from a startinglanding to another landing, means to start the car from the startinglanding on its travel toward the other landing, and means controlledfrom the starting landing for causing the car to return to the startinglanding, said means being controllable while the car is in motion.

In testimony whereof We have hereunto set our hands in the presence ofthe subscribing Witnesses, on this 6th day of April,

HAROLD ROWNTREE. BERNARD ROWNTREE. Vitnesses D. M. Snnovnn, LAURA E.SMITH.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of latent; Washington, I). G.

